<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
    <div id="box">
        <span> {{Message}} </span>
    </div>

    <script>
        const { createApp } = Vue
        createApp({
            data () {
                return {
                    Message : '我的天'
                }
            }
        }).mount('#box')
    </script>


<!-- <script>
  const { createApp } = Vue
  
  createApp({
    data() {
      return {
        message: 'Hello Vue!'
      }
    }
  }).mount('#app')
</script> -->

</body>
</html>